[PATCH 00/10] AXFS: Advanced XIP filesystem
jaredeh at gmail.com
Tue Sep 2 12:44:19 EDT 2008
> I found what's wrong.
> The size of an AxFS image created by mkfs.axfs is always n*4096+4 bytes large.
> So when it wants to check the magic value in the last 4 bytes, the block layer
> tries to read a whole 512-byte sector, which fails for loop-mounted images.
> If you test on real FLASH, additional bytes after the end of the AxFS image can
> be read, hence it works.
> By padding the image with 508 zero bytes, I can mount it, on both PS3 (ppc64)
> and UML (ai32). I can even read images created on PS3.
Right. We haven't tested loopback since we added the magic end value.
How is one expected to read those last 4 bytes of a loopbacked file?
Are they unreadable? We can add the padding. I am just wondering if
this is a bug or a known limitation in the loopback handling or if
there is a different safer way of reading block devs with truncated
> However, there still are weird things going on, like `find' not seeing all
> files and directories, or just aborting, and `ls -lR' showing actual file
> contents in its output.
Do you see this behavior for all builds for just the PS3?
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